Browsing by Subject "nickel superalloy"
Now showing 1 - 3 of 3
- Results Per Page
- Sort Options
Item Effects of Build Orientation and Heat Treatment on Neutron Irradiation Hardening in Inconel 625 Fabricated via Laser Powder Bed Fusion(University of Texas at Austin, 2021) Andurkar, Mohanish; O-Donnell, Valentina; Gahl, John; Prorok, Bart; Keya, Tahmina; Harvill, Greyson; Thompson, ScottVarious Inconel 625 coupons fabricated via Laser Powder Bed Fusion (L-PBF) were neutron irradiated using the inside reflector of the reactor at the University of Missouri Research Reactor (MURR). Effects of build orientation and heat treatment on neutron-induced hardening were investigated by inspecting L-PBF samples built vertically or at a 45º angle in the following heat-treated conditions: as-built (no heat treatment), 700 ºC for 1 hour, 900 ºC for 1 hour, and 1050 ºC for 1 hour. The microhardness results of L-PBF samples before and after neutron irradiation were compared with traditional wrought Inconel 625. All samples underwent an irradiation flux of 6.61 x 1013 neutrons/cm²/s for 310 hours for an estimated damage of 0.012 dpa. Results indicate that as-built L-PBF specimens are less prone to radiation hardening relative to their wrought counterparts. As-printed diagonal specimens were shown to harden by 8% as compared to 1.2% hardening in as-printed vertical specimens.Item Mechanical Assessment of a LPBF Nickel Superalloy Using the Small Punch Test Method(University of Texas at Austin, 2017) Davies, S.J.; Jeffs, S.P.; Lancaster, R.J.; Baxter, G.With the continuous drive of the aerospace industry to introduce Additive Layer Manufacturing (ALM) into next generation gas turbine engines, the requirement to understand their mechanical performance has grown. However, limitations in material availability due to the nature of the process can restrict the scope for conventional mechanical testing. The Small Punch Tensile (SPT) test provides an effective tool for ranking the performance of ALM processed alloys, credited to the small volumes of material utilised and the ability to sample localised regions. This technique has been applied to the nickel superalloy C263, manufactured via Laser Powder Bed Fusion (LPBF) in different build orientations and subjected to contrasting post process heat treatments. To fully understand the effects of these process variables on the mechanical response of LPBF alloys, empirical correlations have been derived between SPT and uniaxial data attempting to demonstrate the suitability of this approach in characterising the properties of ALM structures.Item Residual Stress Measurements via X-ray Diffraction Cos α Method on Various Heat-Treated Inconel 625 Specimens Fabricated via Laser-Powder Bed Fusion(University of Texas at Austin, 2021) Andurkar, Mohanish; Suzuki, Toshikazu; Omori, Masanao; Prorok, Bart; Gahl, John; Thompson, ScottThe residual stress and hardness of Inconel 625 fabricated using Laser Powder Bed Fusion (L-PBF) were experimentally investigated. As-built Inconel 625 samples were subjected to three different heat-treatment temperatures of 700℃, 900℃, 1050℃ for one hour. Effects of these three-stress relieving heat treatment temperatures on the nature and value of residual stress were studied. Residual stress measurements were recorded using a portable X-ray system. The system calculated residual stress using the cos α method. The Full Width Half Maximum (FWHM) of diffraction peaks in all samples were measured. The results indicate that tensile residual stress was present on the surface of as-built L-PBF sample and compressive residual stress on the surface of heat-treated samples due to stress relief. Debye-Scherrer (D-S) ring positions were measured using the cos α method and compared with a reference wrought Inconel 625 ring position. Vickers microhardness and residual stress were found to be positively correlated.